Telegraph circuits



F. H. FAY

TELEGRAPH CIRCUITS Filed Oct. 8, 1923 IN VEN TOR A TTORNE Y Patented Feb. 9, 1926.

FRANK n. Far, or BROOKLYN,

New' Yoan, Assis-Noa fro Annarean annulations AND TELEGABH COMPANY, A CORPORATXON F NEVI YORK.

TFELEGRAPH' CIRCUITS.

Appncaupn sied october a, 1923. serial No. 667,377.

To Zt 'whom 'it may concern.'

lie it known that l, FRANK H. FAX, residing at Brooklyn, in the county ot' Kings 'and State ot'New York, have invented cer# tain Improvements in Telegraph Circuits, 'et 'which the following is aA specification.

`'his invention relates `to"telegraph cir cuits and particularly to such circuits in which impulses of positivea and negative .pplarity are employed for the transmission or signals.`

it is 'one ot the features of the invention to providel repeater sets 'for such circuits which will operate automaticallyand without cihreaking arrangements. Thetype oli telegraph circuit for which the repeater set et this invention isA adapted is one in which nreai'is are provided at the terminal stations "whereby positive and negative signal impulses may be transmitted and whereby the line may he connectedv to ground through a polar receiving relay when the station is not sending. T@Vith suchcircuits therepeatei.' set of this invention will give improved high speed automa-tic operation. Other features and details of the arrangements 'of the` invention will appear more fullyiirom the 'following detailed description thereof.

The invention' may be more fully understood from the following detailed description, together with the accompanying drawing, in the ligure of which is illustrated a circuit diagram of the invention.

In the drawing are shown two line sections Ll and L.2 interconnected by the repeater set ot this invention. It is understood that means are provided at the terminal stations with which these line sections are associated, whereby positive and negative signal impulses may be transmitted and whereby the line sections may be connected to ground through a polar receiving relay when the station is not sending. The repeater set comprises the polar relays l, 2, 3 and Ll. These polar relays have biasing windings b1, b2, 1) and?)4 connected in a biasing circuit with battery 5. The relays also have actuating winding al, 0,2, as and un4x which may be associated with the line sections. Relays ,l and #l have the negative batteries 18 and2l, respectively, associated therewith, awhile relays 2 and 3 have the positive oatteries 19 and 20, respectively, associated therewith. PQE-Changing keys l, and K2 and a polarized sounder 22 are wired through switches Sl, and S, respectively, for testing the repeater operation and for communicating purposes between tlierepeatei" station andA the terminal stations. i

The invention may be more fully understood from the following `vdescription of its operation. As has beenpointed out heretofore, at each ot' the distant stations arrangements a`re provided'tor connecting and disconnecting thesending and receiving appara-tus `to and 'from the line thereat, so that with the circuit idle the line current will be zero. A. slight biasing current is provided through one of the windings of each relay as' follows: from ground and' battery 5, winding 1) conductor V6, winding b3, conductor 7, winding b1, conductor 8, winding Z22, conductor 9, to ground. ln case there is no current through the actuating windings, as when the circuit is idle, this biasing current will hold the `armatures of relays l and Ll against their left-handcontacts and the ari-natures ot' relays 2 and 3 against their' right-hand contacts vas shown in the drawing. It the station associated with line L, should now start to send, the impulses would be received at the repeater as follows: Jfrom line L1, lett-hand contact ot relay l, conductor 10, right-hand contact ot relay 2, conductor 1l, winding (a, oi relay 3, conductor 12, winding ci., ot relay 4t, conductor 13, to ground. A positive or spacing impulse from line L, will cause the armature of relay 3 to move over to its le'lthand contact against the action of the biasing current. This received positive impulse will aid the biasing current through relay 4 to hold its armature against the left-hand contact. The operation of relay ES will causeh a positive or spacing impulse `to be sent out over line L, as follows: from positive battery 20, left-hand contact of relay 3, conductor la, left-hand contact of relay 4i, `and thence out over line L2. Similarly, a negative or marie ing impulse will aid the biasing current in relay 3 to hold its armature against its right-hand contact but will cause the armature of relay fi to be moved over to its righthand contact. This will cause a negative or marking impulse to be applied to the line L2 from battery 2l. In this manner the impulses received rom line Ll are repeated over line L2. The impulses received at the repeater when the station associated with line L2 is sending are repeated over line L1 in a manner substantially the same as already described and no further description thereof will be given.

The pole-changing keys K1 andK2 and a polarized sounder Q2 are wired through the switches S1, S, and S, respectively, for testing the repeater operation and for communieating purposes between the repeater station and the terminal stations. In order to test the operation of reiays l and 2, or to send on line L1, the pole-changing key K., should be connected to the armature of relay et by the operation of the two point switch S2. The operation ol' key K2 will now transmit impuises over the contacts oit' relays 4f and 5 and the windings of relays l and 2 to ground in the saine manner as for the received impulses from line L2, operating relays l and 2 to repeat the signals to line L1. By throw`- ing the switch S to its uppery position the sounder 22 will be operatedby the leak current from the outgoing signals over line L1. rhis will allow the operator to determine the condition of his relays and also to read the signals he may be transmitting. In testing the operation of the relays and Llor for sending out over line L2, the switch SL of the pole-changing key K1 should be operated and the switch S of the` polarized sounder 22 moved to its downward position.

W/hile the arrangements of the invention have been disclosed as embodied in certain specic arrangements which are deemed desirable, it is understood that they are capable of embodiment in many and widely varied forms Without departing from the spirit of the invention as defined in the appended claims.

lWhat is claimed is:

l. A telegraph repeater interconnecting two line sections, said repeater including two sets of polar relays having' actuating windings and biasing windings, said biasing windings being so arranged that the actuating windings of one set or" relays will be con nected to one of the line sections over the contacts of all of the relays of the other set.

2. A telegraph repeater interconnecting two line sections, said repeater including two sets of polar relays having actuating windings and biasing windings, said windings being so-poled and arranged that normally t-he actuating windings of one set of relays will be connected to one of the line sections over the contacts of all of the relays ol the other set, and the actuating windings of said last n'ientioned set of relays will be connected to the other line section over the contacts ot all of the relays of said first mentioned set.

3L A telegraph repeater interconnecting two line sections, said repeater' including two sets of polar relays having actuating windings and biasing windings, said windings being so arranged and poled that normally the actuating windings of one set of relays wil be connected to one of the line sections over the contacts of all of the relays of the other set, and means controlled by said actuating windings for applying to the line section sources of current of different potential.

In testimony whereof, I have signed my name to this specification this 3rd day of October, 199,3.

FRANK H. FA Y. 

